Measurement of atm layer quality of service parameters using oam cells
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2004
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| _version_ | 1876430709856403456 |
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| author | Joaquin García Hernández |
| author_facet | Joaquin García Hernández |
| contents | Measurement of atm layer quality of service parameters using oam cells Joaquin García Hernández Mohammed Ghanbari Ingeniería Variable Bit Rate Quality of Service Cell Delay Variation Operation and Maintenance The measurement of the quality of service in ATM* networks involves the activation of the ATM layer managementOAM functions. Once an ATM connection is set up, in-service performance monitoring based on OAM cells can beused to measure and estimate the ATM layer QoS parameters. In-service measurement of ATM layer QoS parameterssuch as cell delay variation, cell transfer delay, cell loss ratio, etc., is necessary to verify on one hand, if the networkis meeting the requested QoS and on the other hand, if the users are receiving their promised QoS. Congestionconditions in ATM switches may cause gradual deteriorations in the quality of virtual paths or virtual channelconnections in an ATM network. QoS measurement using OAM cells can accurately measure the overall quality ofmonitored ATM layer QoS parameters in order to detect such deteriorations before the service quality has droppedbellow an acceptable level. Several factors such as network load, congestion, bottlenecks, and incremenTS innetwork load may affect the cell delay variation of video transmissions in an ATM network. In this work, several ATMlayer QoS parameters have been measured on a VBR video source using OAM cells. The simulation resulTS obtainedshow that with low network loads, the contribution of each individual ATM switch to the local and to the end-to-endCDV is not significant. In the presence of a bottleneck switch, the CDV presented by this switch becomes thedominant one at both local and end-to-end sides. When the network load is between 0.5 and 0.6, small incremenTSin network load do not alter the buffer performance of the non-congested ATM switches, and low values of CDVcan be obtained. In contrast, it was found that there is a critical load between 0.65 and 0.7 where small incremenTSin network load may force the CDV to grow abruptly. 2004 artículo científico 1665-6423 https://www.redalyc.org/articulo.oa?id=47420206 en http://www.redalyc.org/revista.oa?id=474 Journal of Applied Research and Technology application/pdf Universidad Nacional Autónoma de México Journal of Applied Research and Technology (México) Num.2 Vol.2 |
| format | Artículo científico |
| id | redalyc_47420206 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Measurement of atm layer quality of service parameters using oam cells Joaquin García Hernández Ingeniería Variable Bit Rate Quality of Service Cell Delay Variation Operation and Maintenance Measurement of atm layer quality of service parameters using oam cells Joaquin García Hernández Mohammed Ghanbari Ingeniería Variable Bit Rate Quality of Service Cell Delay Variation Operation and Maintenance The measurement of the quality of service in ATM* networks involves the activation of the ATM layer managementOAM functions. Once an ATM connection is set up, in-service performance monitoring based on OAM cells can beused to measure and estimate the ATM layer QoS parameters. In-service measurement of ATM layer QoS parameterssuch as cell delay variation, cell transfer delay, cell loss ratio, etc., is necessary to verify on one hand, if the networkis meeting the requested QoS and on the other hand, if the users are receiving their promised QoS. Congestionconditions in ATM switches may cause gradual deteriorations in the quality of virtual paths or virtual channelconnections in an ATM network. QoS measurement using OAM cells can accurately measure the overall quality ofmonitored ATM layer QoS parameters in order to detect such deteriorations before the service quality has droppedbellow an acceptable level. Several factors such as network load, congestion, bottlenecks, and incremenTS innetwork load may affect the cell delay variation of video transmissions in an ATM network. In this work, several ATMlayer QoS parameters have been measured on a VBR video source using OAM cells. The simulation resulTS obtainedshow that with low network loads, the contribution of each individual ATM switch to the local and to the end-to-endCDV is not significant. In the presence of a bottleneck switch, the CDV presented by this switch becomes thedominant one at both local and end-to-end sides. When the network load is between 0.5 and 0.6, small incremenTSin network load do not alter the buffer performance of the non-congested ATM switches, and low values of CDVcan be obtained. In contrast, it was found that there is a critical load between 0.65 and 0.7 where small incremenTSin network load may force the CDV to grow abruptly. 2004 artículo científico 1665-6423 https://www.redalyc.org/articulo.oa?id=47420206 en http://www.redalyc.org/revista.oa?id=474 Journal of Applied Research and Technology application/pdf Universidad Nacional Autónoma de México Journal of Applied Research and Technology (México) Num.2 Vol.2 |
| title | Measurement of atm layer quality of service parameters using oam cells |
| topic | Ingeniería Variable Bit Rate Quality of Service Cell Delay Variation Operation and Maintenance |
| url | https://www.redalyc.org/articulo.oa?id=47420206 |